:root{--bg:#faf9f6;--ink:#25272a;--muted:#686b70;--line:#e2e2de;--panel:#f0f1ed;--accent:#466d95;--good:#46745a;--gold:#977021}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.7 ui-sans-serif,system-ui,-apple-system,sans-serif;-webkit-font-smoothing:antialiased}body.dark{--bg:#181a1d;--ink:#eeefeb;--muted:#b0b3b8;--line:#36393d;--panel:#24292d;--accent:#a5c6e9;--good:#9bd2ac;--gold:#e5c77b;color-scheme:dark}button,input{font:inherit}button{cursor:pointer;color:inherit;min-height:44px;border:1px solid var(--line);border-radius:8px;padding:8px 15px;background:var(--bg)}button:disabled{opacity:.45;cursor:not-allowed}a{color:inherit;text-underline-offset:4px}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible,[tabindex]:focus-visible{outline:2px solid var(--accent);outline-offset:4px}[hidden]{display:none!important}.shell{max-width:1040px;margin:auto;padding:0 28px}.top{display:flex;gap:18px;align-items:center;border-bottom:1px solid var(--line);height:84px}.top>a:first-child{font-weight:700;font-size:25px;letter-spacing:-2px;text-decoration:none;margin-right:auto}.top>a:nth-child(2){font-size:12px;color:var(--muted);text-decoration:none}.top button{font-size:11px;padding:6px 10px;background:transparent;border:0}.top #theme{font-size:22px}.intro{padding:48px 0 24px}.overline{font-size:10px;letter-spacing:.16em;color:var(--muted)}h1,h2,p{margin:0}h1{font-weight:560;font-size:clamp(32px,5vw,49px);letter-spacing:-.055em;line-height:1.2;margin:12px 0 14px}h1 span{color:var(--accent)}.intro>p:last-child{color:var(--muted);font-size:16px}.toolbar{display:flex;justify-content:space-between;gap:12px;align-items:center;margin:10px 0}.modes{display:flex;padding:4px;background:var(--panel);border-radius:10px;gap:4px}.modes button{border:0;font-size:12px;background:transparent}.modes button[aria-pressed=true]{background:var(--ink);color:var(--bg)}.quiet{font-size:12px;border:0;background:none}.mode-help{color:var(--muted);font-size:12px;margin:12px 0 28px}#save-status{font-size:12px;color:var(--accent)}#save-status:empty{display:none}.game-layout{display:grid;grid-template-columns:230px minmax(0,1fr);gap:32px;align-items:start}.map-panel{border:1px solid var(--line);border-radius:14px;padding:20px;background:linear-gradient(150deg,var(--panel),var(--bg))}.map-header{display:flex;justify-content:space-between;font-size:10px;letter-spacing:.1em;color:var(--muted)}progress{width:100%;height:5px;border:0;border-radius:5px;overflow:hidden;margin:14px 0;background:var(--line);accent-color:var(--good)}progress::-webkit-progress-bar{background:var(--line)}progress::-webkit-progress-value{background:var(--good);transition:width .4s}.map{list-style:none;padding:0;margin:0}.map li{display:flex;gap:10px;align-items:center;font-size:11px;padding:6px 0;color:var(--muted);position:relative}.map-number{width:25px;height:25px;display:grid;place-items:center;border:1px solid var(--line);border-radius:50%;font-size:10px;flex-shrink:0;background:var(--bg)}.map .complete{color:var(--good)}.complete .map-number{border-color:var(--good);background:color-mix(in srgb,var(--good) 10%,var(--bg))}.map .current{color:var(--ink);font-weight:650}.current .map-number{background:var(--accent);border-color:var(--accent);color:var(--bg);box-shadow:0 0 0 4px color-mix(in srgb,var(--accent) 10%,transparent)}.map-state{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}.best{font-size:11px;border-top:1px solid var(--line);margin-top:16px;padding-top:15px;color:var(--muted)}.hud{display:flex;justify-content:space-between;align-items:center;margin:0 0 15px;font-size:13px}.hud #timer{font-variant-numeric:tabular-nums;color:var(--muted)}.question-card{position:relative;padding:30px;border:1px solid var(--line);border-radius:16px;background:linear-gradient(150deg,var(--panel),var(--bg) 55%);min-width:0}.question-top{display:flex;gap:12px;justify-content:space-between;font-size:10px;letter-spacing:.07em;color:var(--muted);margin-bottom:25px}.question-top #stage-badge{color:var(--accent)}.question-card h2{font-size:20px;line-height:1.5;font-weight:500;letter-spacing:-.025em}.formula{margin:30px 0;overflow-x:auto;overflow-y:hidden;padding:8px 0;font-size:20px}.katex-display{margin:.3em 0!important}.katex-display>.katex{text-align:left!important}.question-card label{display:block;font-size:12px;color:var(--muted);margin:20px 0 8px}input:not([type=radio]){display:block;width:100%;min-width:0;padding:13px 15px;border:1px solid var(--line);border-radius:8px;background:var(--bg);color:var(--ink);font-size:18px}.input-help{font-size:11px;color:var(--muted);margin:9px 0 20px}.primary{background:var(--ink);color:var(--bg);border-color:var(--ink);font-size:13px;font-weight:500;padding:11px 19px}.assistance{display:flex;gap:14px;align-items:center;margin-top:22px;border-top:1px solid var(--line);padding-top:14px;flex-wrap:wrap}.assistance button{border:0;background:transparent;font-size:12px;padding:5px 0;text-decoration:underline;text-underline-offset:4px}.assistance span{margin-left:auto;font-size:10px;color:var(--muted)}.hint{padding:14px;background:var(--panel);border-radius:8px;font-size:13px;margin-top:12px}.solution{margin-top:15px;font-size:13px}.solution h3{font-weight:550}.solution ol{padding-left:20px}.solution li{margin-bottom:9px}.feedback{min-height:28px;margin:14px 0;color:var(--good);font-size:13px;font-weight:550}.choices{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:24px 0}.question-card .choice{display:flex;gap:10px;align-items:center;padding:12px;border:1px solid var(--line);border-radius:8px;margin:0;cursor:pointer;min-height:54px}.choice:has(:checked){background:var(--panel);border-color:var(--accent)}.choice input{accent-color:var(--accent);width:17px;height:17px}.choice span{color:var(--ink);font-size:16px}.instructions{font-size:12px;color:var(--muted);border-top:1px solid var(--line);padding-top:15px}.instructions summary{cursor:pointer;color:var(--ink);min-height:35px}.instructions p{margin:12px 0}.results{position:relative;border:1px solid var(--line);border-radius:16px;padding:30px;background:var(--panel)}.results.won{border-color:var(--gold);background:linear-gradient(145deg,color-mix(in srgb,var(--gold) 12%,var(--bg)),var(--bg))}.trophy{font-size:52px;color:var(--gold);line-height:1;margin-bottom:22px}.results h2{font-size:30px;letter-spacing:-.04em;font-weight:550;margin:10px 0}.results>p:not(.overline){color:var(--muted);font-size:14px}.results dl{display:grid;grid-template-columns:1fr 1fr;gap:20px;border-block:1px solid var(--line);padding:23px 0;margin:25px 0}.results dt{font-size:11px;color:var(--muted)}.results dd{margin:3px 0 0;font-size:21px;letter-spacing:-.03em}.results dl>div:first-child{grid-column:1/-1}.result-actions{display:flex;gap:10px;flex-wrap:wrap}.result-actions button{font-size:12px}.post-solution{margin-top:24px;font-size:13px}.post-solution summary{cursor:pointer}.post-solution p{margin-top:15px}#share-status{white-space:pre-line;margin-top:15px;font-size:12px}.burst{position:absolute;left:50%;top:45%;pointer-events:none}.burst i{position:absolute;width:6px;height:8px;border-radius:2px;background:#77b68d}.burst i:nth-child(3n){background:#8cb4dd}.burst.gold i{background:#dab65d}.skip{position:absolute;top:-100px;left:20px}.skip:focus{top:15px;background:var(--bg);z-index:5;padding:12px}footer{border-top:1px solid var(--line);margin-top:55px;padding:25px 0;font-size:12px;color:var(--muted)}
@media(prefers-reduced-motion:no-preference){button{transition:transform .16s,background .16s}button:hover{transform:translateY(-1px)}button:active{transform:scale(.98)}.level-up{animation:level-up .8s ease-out}.milestone{animation:milestone .85s ease-out}.burst i{animation:burst 1s ease-out forwards}@keyframes level-up{25%{box-shadow:0 0 35px #77b68d44;border-color:var(--good);transform:scale(1.012)}100%{transform:none}}@keyframes milestone{30%{box-shadow:0 0 45px #dab65d55;border-color:var(--gold);transform:scale(1.02)}}@keyframes burst{from{opacity:1;transform:translate(0,0) scale(1)}to{opacity:0;transform:translate(var(--x),var(--y)) rotate(150deg) scale(.5)}}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}.burst{display:none}}
@media(max-width:760px){.shell{padding:0 20px}.intro{padding-top:32px}.game-layout{grid-template-columns:1fr;gap:22px}.map-panel{padding:16px}.map{display:grid;grid-template-columns:repeat(7,1fr);gap:9px 3px}.map li{padding:3px;justify-content:center}.map li>span:nth-child(2){display:none}.map li:last-child .map-number{border-color:var(--gold)}.map-number{width:29px;height:29px}.best{font-size:10px;margin-top:12px;padding-top:10px}.map-header{font-size:10px}.question-card{padding:23px}.toolbar{gap:3px}.modes button{padding:7px 10px;font-size:11px}.quiet{padding:7px;font-size:11px}.formula{font-size:18px}.question-top{margin-bottom:20px}.question-card h2{font-size:19px}.top{height:72px;gap:10px}.results{padding:24px}.results h2{font-size:27px}.mode-help{margin-bottom:20px}.assistance{gap:15px}.assistance span{margin-left:0}.question-card .choice{padding:10px}.choices{grid-template-columns:1fr}.map li:last-child{grid-column:auto}}

.level-up input:not([type=radio]){border-color:var(--good);background:color-mix(in srgb,var(--good) 12%,var(--bg))}